# Let f(x)=2x^2+2, how do you find f(0.3)?

Oct 27, 2016

$f \left(x\right) = y = 2.18$

#### Explanation:

$f \left(\textcolor{red}{x}\right) = 2 {x}^{2} + 2 \text{ } \leftarrow$ the right side shows what is done to $x$
$\textcolor{w h i t e}{x} \downarrow$
$f \left(\textcolor{red}{0.3}\right) \text{ } \leftarrow$ you are told that $x$ has the value $0.3$

$f \left(\textcolor{red}{x}\right) = 2 \textcolor{red}{{x}^{2}} + 2$

$f \left(\textcolor{red}{0.3}\right) = 2 \textcolor{red}{\left({0.3}^{2}\right)} + 2$

$\textcolor{w h i t e}{\times \times} = 2 \times 0.09 + 2$

$\textcolor{w h i t e}{\times \times} = 2.18$